MoltenVK VS MoltenGL

https://github.com/KhronosGroup/MoltenVK

Translating between rendering APIs is not really the problem. The GPU design is more different than the API is.

Khronos maintains MoltenVk though, which is "official" as it gets: https://github.com/KhronosGroup/MoltenVK

...technically, Vulkan on Windows is also only supported via 3rd-parties (the GPU vendors), Microsoft doesn't support Vulkan either ;)

Recent MoltenVK from Release for Vulkan SDK 1.3.243, I have built this library, you can download it here

For the brave ones who are willing to get their hands a little dirty, I discovered some ways to both improve performance and get rid of the graphical issue with the ocean on Kerbin. To do so, you need to build the latest MoltenVK and grab the latest DXVK release and update the proper files in your Crossover installation. In addition, you need to copy the dxvk.conf file and place it in the same directory as KSP2_x64.exe. Set enableRefactoring, ignoreGraphicsBarriers, and enableAsync to True in this config file. My experience from these tweaks was a 20-25% increase in FPS.

It's not made by Apple, but MoltenVK is free, open source and works great on M1/M2 hardware. It's used by many commercial game ports to Mac/iOS devices.

https://github.com/KhronosGroup/MoltenVK

Yeah that's true. I think there is a MoltenVK thread on potentially using this as well (https://github.com/KhronosGroup/MoltenVK/discussions/1616). I think it's possible to emulate geometry shaders with mesh shaders (which are more flexible anyway), but it's not trivial as the two pipelines aren't completely the same so it would require a bit of work.

Don't think there's a proper fix just yet judging from this issue, which links to an open issue for needing geometry shaders (described as not-a-priority).

Despite championing OpenGL back when DirectX was their main competitor, now their OpenGL support is deprecated (i.e. it works but has not had new features in close to a decade) and they're expecting everybody to switch to Metal. There exist some compatibility layers like MoltenVK and MoltenGL that were developed or acquired by the OpenGL/Vulkan group, but they do have some limitations. Apple is not helping with their development at all, either, and will not provide developer support for using them.